A 40-year-0ld Texas man stands charged with the stabbing death of a 77-year-old grandfather as he rode his bicycle to work earlier this month.

Houston Police say Aaron Bartholomew Sheehan was booked into the Harris County Jail on Tuesday, charged with murder in the August 7 death of Anival Patricio Elvir Ortiz, KHOU reported.

Ortiz was on his way to work at about 5:45 a.m. that morning, riding his bike on a trail along Harrisburg Boulevard. Surveillance video showed the suspect step out from behind a fence and stab Ortiz in the back. Ortiz kept riding for about 10 minutes, until he got to work. Once there, he told coworkers that a man hit him on his ride, then he collapsed. He was taken to a hospital, where he was pronounced dead.

“He might not have realized his injuries were so severe, and he just kept riding his bike,” Houston Police Sgt. Mark Holbrook said.

Investigators followed a blood trail back to where they believe the attack took place, and from there, found the surveillance video. The suspect was spotted shortly after the stabbing at a mass transit station, and police released images of him asking for help with an identification.

Five days later, Sheehan was in custody.

Sheehan was not in court on Wednesday when a judge set his bond at $1 million because he was undergoing a mental health evaluation.