DETROIT — Fiat Chrysler is speeding up a recall of 1.1 million vehicles with confusing gear shifters like one in the SUV that crushed and killed ‘Star Trek’ actor Anton Yelchin.

Yelchin, 27, known for playing Chekov in the rebooted series, died Sunday after his 2015 Jeep Grand Cherokee pinned him against a mailbox pillar and security fence at his home in Los Angeles. His Jeep was among the vehicles recalled in April due to complaints from drivers who had trouble telling if they put the transmission in “park” after stopping. Many reported the vehicles rolled off after the driver exited.

Yelchin would not have known about the software fix because car owners hadn’t yet been notified. Fiat Chrysler said Wednesday that it would start sending letters to owners on June 24 telling them to make a service appointment.

Safety advocates have questioned why the fix was taking so long.