A suspected murder-suicide at a Taco Bell drive-thru in Cuyahoga Falls, Ohio, has left investigators puzzled, as the shooter and victim appeared to be strangers.

On Wednesday evening, 53-year-old Jason Williams shot 25-year-old Megan Keleman following a brief altercation after she pulled in front of him in the drive-thru.

Williams then shot himself. Keleman’s death was ruled a homicide, while Williams’ was ruled a suicide, Fox News has reported.

Authorities have found no evidence that the two knew each other, and the motive remains unclear. A community vigil for Keleman was scheduled for Sunday evening at Stow City Hall.

Written by B.C. Begley