Initial inconsistencies in Sitzlack’s story led prosecutors to ask for probable cause for domestic violence murder at a court hearing in 2023. Police carried out “numerous search warrants” over months, but there was not enough evidence to disprove Sitzlack’s self-defense argument, McNerthney said. He was never charged in that case.

Richard Sitzlack, the man accused of stabbing Metro bus driver Shawn Yim to death, is now facing first-degree murder charges.