A motorcyclist died Tuesday after crashing into a semitrailer in Back of the Yards on the South Side.

Joseph Bottari, 43, was eastbound on a motorcycle about 10:05 a.m. in the 700 block of East 51st Street when he crashed, according to Chicago Police and the Cook County medical examiner’s office.

Police said he failed to stop at a stop sign and struck the back end of a semi turning left from 51st to southbound Halsted. His motorcycle was unregistered.

Bottari, who lived in southwest suburban Justice, was pronounced dead at the scene, authorities said. No citations were issued, police said.

An autopsy released Wednesday found Bottari died of multiple injuries from the crash, the medical examiner’s office said. His death was ruled accidental.