Tyler Mook Case: Missing Wife, Florida Attack, and Conviction

The Tyler Mook case involves two connected but legally separate matters: the 2011 disappearance of his ex-wife, Shelley Mook, a 24-year-old Tennessee teacher and mother who has never been found, and Tyler Mook’s 2016 Florida conviction for attempting to drown his girlfriend on a boat. He is serving 12 years in a Florida prison for attempted second-degree murder. The Tennessee Bureau of Investigation names him a person of interest in Shelley’s disappearance, but he has never been charged in that case.¹

What Happened to Shelley Mook

Shelley Mook was last seen on the afternoon of February 28, 2011, in Shelbyville, Tennessee. She dropped her six-year-old daughter, Lilliana, at Tyler Mook’s residence after school and went inside to return a box of his belongings. Lilliana, later interviewed by a child specialist, said she stayed in the car and watched her mother appear upset before going through the door. She never saw her again.¹

Shelley’s cell phone last pinged a tower in Beech Grove, Tennessee, around 7:30 p.m. that evening. About five hours later, at roughly 12:30 a.m. on March 1, firefighters responded to an empty farm field in Rutherford County, near the Bedford County line, and found her Pontiac Grand Prix engulfed in flames. Investigators concluded the fire was arson, set to destroy evidence. No body, no keys, and no additional clues were recovered from the vehicle.¹

The Accidental 911 Call

One of the more scrutinized pieces of evidence is a 22-minute pocket-dialed 911 call from Tyler Mook’s phone, recorded while he was apparently working in a garage with his father. During the call he was captured discussing the investigation, reportedly saying “someone seen me walking down the road in the middle of the night” and “they’ve seen Shelley’s car going down that road that night.” He was also heard saying, “They can’t prove nothing. They wanna come and arrest me with a warrant.”¹²

Kevin Keele, a former police officer hired by Shelley’s family to investigate, said much of the recording was drowned out by machine noise. He also noted that Mook called the 911 center back a few minutes later to ask whether the accidental call had been recorded.³

A Documented History of Violence

Shelley and Tyler Mook married in 2004 and divorced on October 15, 2009. The Bedford County Circuit Court’s divorce decree stated that the marriage had “subjected Mother to acts of domestic violence by Father.”⁴

In the custody hearing that followed Shelley’s disappearance, multiple witnesses described physical abuse. They testified to frequently seeing severe bruising on Shelley’s neck, wrists, and arms, including marks on her neck that resembled fingerprint impressions. A close friend, Brittany Brooks, testified that Tyler would grab Shelley by the wrist and shove her against walls.¹

Testimony also described a road-rage episode in which Mook chased the vehicle carrying Shelley and their daughter, swerving aggressively enough to force Shelley into an oncoming-traffic lane. He was arrested but not charged. A Bedford County sheriff’s deputy from the 17th Judicial Drug Task Force testified that Mook had admitted involvement in the marijuana business, and court records described sales of up to three pounds at a time and marijuana stored in the home freezer while his daughter was present.⁴

Losing Custody of Lilliana

Tyler Mook took immediate custody of Lilliana after Shelley vanished. On March 8, 2011, Shelley’s mother, Debbie Sikora, filed an emergency petition for visitation, followed the next day by an amended petition for full custody.⁴

During a videotaped deposition for the custody case, Tyler Mook invoked his Fifth Amendment right against self-incrimination more than 140 times when asked about the events of February 28, 2011. The trial court drew negative inferences from his silence and noted that, unlike a typical parent fighting for custody, Tyler “did not testify for his love for Lily.”¹

On July 27, 2011, the court declared Tyler Mook “unfit to parent” and found he posed a “substantial risk of harm” to Lilliana because of his “dangerous temper,” domestic violence history, drug trafficking, and exposure to “undesirable associates.” Sikora was named primary residential parent and permitted to relocate the child to Pennsylvania. Tyler received supervised visitation only.⁴ On November 6, 2012, the Tennessee Court of Appeals affirmed, finding the evidence “clearly and convincingly established” that placing the child with her father would expose her to substantial harm.⁵ The Supreme Court of Tennessee denied a further appeal on February 25, 2013.⁶

The Florida Attack

Tyler Mook moved to Florida in 2012 and began dating Robin Doneth. Doneth, who later said she noticed a physical resemblance between herself and Shelley, described him as charming at first. After a few months she searched his name online, found reports naming him a person of interest, and confronted him. He told her the reports were untrue and that Shelley had left the country.¹

On October 4, 2014, during a boat trip near Sandsprit Park in Martin County, Florida, an argument broke out after Doneth complained about Mook racing through slow-speed manatee zones. According to the arrest affidavit and witness testimony, Mook threw Doneth overboard, jumped in after her, and held her face underwater repeatedly. A witness, Nicole Guajardo, testified that Mook said, “No one disrespects me in front of my family. I’ll kill her.”⁷ Doneth testified she managed to surface for a quick gasp of air before being pushed under again. Passengers on a passing boat saw the attack. Tyler’s brother, Andrew, jumped into the water and put Tyler in a chokehold until he released her.¹

The initial charge was misdemeanor battery. After Andrew Mook testified under subpoena about what he witnessed, prosecutors elevated the charge to attempted first-degree murder. Tyler was arrested on a warrant on December 13, 2014.⁷

Conviction, Sentence, and Postconviction Appeal

Tyler Mook’s defense attorney advised him to reject a five-year plea offer, reportedly telling him the state could only prove a misdemeanor because it could not establish premeditation. On March 24, 2016, a Martin County jury found him guilty of the lesser included offense of attempted second-degree murder, which does not require proof of premeditation. He was sentenced in May 2016 to 12 years in a Florida prison, with credit for roughly two years already served.⁸⁹

Mook later filed a postconviction motion claiming ineffective assistance of counsel, arguing his lawyer had wrongly told him to turn down the plea by underestimating the risk of conviction on the second-degree count. In March 2020, Florida’s Fourth District Court of Appeal reversed the summary denial of that claim and sent it back to the trial court for an evidentiary hearing.⁹ The outcome of that hearing is not documented in available records.

Where the Shelley Mook Case Stands

Shelley Mook has never been found. No remains have been recovered. The case is still officially classified as a missing-persons investigation rather than a homicide, though law enforcement has said publicly they believe she is deceased.⁶ Tennessee District Attorney Robert Carter described the investigation as “very active” and identified the main obstacle as gathering enough evidence to prove a crime beyond a reasonable doubt.¹⁰

Tyler Mook has not been charged in Shelley’s disappearance. The TBI continues to list him as a person of interest and asks anyone with information to call 1-800-TBI-FIND.¹¹ Kevin Keele, who has worked the case pro bono, has said he believes people who know what happened have stayed silent “out of fear or out of a misguided sense of loyalty,” and has urged them to come forward.³ Lilliana continues to live with her grandmother in Pennsylvania.¹

1
CBS News. Shelley Mook Cold Case: 48 Hours Probes 2011 Disappearance of Tennessee Mom
2
True Crime News. Tennessee Man Convicted of Trying to Kill Girlfriend After Wife Mysteriously Disappears
3
WJHL. Murfreesboro Teacher Shelley Mook Still Missing 10 Years Later
4
Tennessee Courts. Sikora v. Mook, Court of Appeals Opinion
5
Tennessee Courts. Debbie Sikora ex rel. Shelley Mook v. Tyler Mook et al.
6
WGNS Radio. New Updates in the Case of Shelly Mook
7
Palm Beach Post. Man Linked to 2011 Slaying
8
Your Erie. Person of Interest in Edinboro Native’s Disappearance Sentenced in Florida
9
FindLaw. Mook v. State, No. 4D19-1422
10
CBS News. Missing Link Between Missing Tennessee Mom and Florida Attempted Murder
11
WKRN. Murfreesboro Teacher Shelley Mook Still Missing 10 Years Later