Years after his death, an anonymous letter has led to an arrest in a hit-and-run crash that killed Baylor University sophomore David Grotberg.

Police on Tuesday arrested Tammy Blankenship Harlan, 50, in connection with the 2016 death of Grotberg, the Waco Tribune-Herald reported.

Harlan, of Waco, was initially booked into McLennan County Jail.

David Grotberg, 19, died after a vehicle struck him while he was cycling in Waco. (Baylor University Golden Wave Band)

Grotberg, a 19-year-old from Minnesota, died on Oct. 6, 2016, after a vehicle struck him while he was riding his bicycle in the 3200 block of Franklin Avenue in Waco. The Tribune-Herald cited witness reports that said the SUV that hit Grotberg did not stop after striking him.

Police said they received an anonymous letter in September 2018 attributing the hit-and-run to Harlan, who the letter claimed was drinking and speeding when she struck Grotberg, the Tribune-Herald reported.

Tammy Blankenship Harlan, 50, was arrested Tuesday in a fatal 2016 hit-and-run. (McLennan County Sheriff's Office)

Detectives found that Harlan had filed an insurance claim for damage to her car shortly after Grotberg's death, claiming she'd hit a stop sign, according to the Tribune-Herald.

Police found blood along a mirror and the front windshield molding on Harlan's vehicle, though a test was inconclusive as to its origin.

Harlan told police in late 2018 that she hit a sign on her way home from a get-together where she was drinking wine. Later, she said she might have hit a homeless person, the Tribune-Herald reported.

Officers arrested Harlan on a charge of failure to stop and render aid, a second-degree felony.

Grotberg was a trumpet player in the Baylor University Golden Wave Band.

Two weeks after he died, his fellow band members honored him at the homecoming football game by presenting his family with his uniform in a frame.

#Baylor honored David Grotberg, the band member who passed away 2 wks ago, by framing his uniform and presenting it to his family. pic.twitter.com/7bIGL0Qde0 — Jessica Morrey (@JessicaMorrey) October 15, 2016

"He was a servant leader within the band. He loved the Band, he loved Baylor, and above all else, he loved the Lord," band leaders said in a written statement. "We mourn this profound loss. We offer our prayers to his family and friends and we ask for your thoughts and prayers as we proceed through this difficult time.

"David, we love you and we will miss you dearly."