SAN FRANCISCO (AP) — The former California transit officer who shot and killed Oscar Grant on a train platform in 2009 said he disagreed with a jury's verdict convicting him of involuntary manslaughter.

Johannes Mehserle, the former San Francisco Bay Area Rapid Transit police officer, was called to the witness stand Wednesday to testify in a civil trial stemming from a lawsuit Grant's father has filed.

Grant's father is suing BART, Mehserle and others over the shooting. Mehserle said he accidentally used his gun when he meant to use his Taser.

Mehserle paused for several seconds when he was asked whether he agreed with the jury's verdict, which led to his serving about a year in a jail. After answering no, Mehserle wasn't asked any follow-up questions about the verdict.

Mehserle's testimony continues Friday.