Honoring Nia Wilson, 18, on what would have been her high school graduation day

OAKLAND, Calif. (KTVU) - Friends and family members remembered Nia Wilson on Wednesday, the day she would have graduated from high school if she had not been killed at an Oakland BART station this summer.

The 18-year-old would have graduated from Dewey Academy as a December graduate from Dewey Academy.

The principal presented her parents with a special plaque to mark the occasion. A chair was also left empty for her, with her cap and gown draped over it. 

“I'm very proud,” her father, Ansar Mohammed, said at the ceremony. “Our family will carry her legacy forever.”

The graduation ceremony also included a special video and speeches to honor her.

Her alleged killer, John Lee Cowell, is returned to court on Thursday, where his attorney argued that he suffers from delusions and paranoia and is incompetent to stand trial.

Prosecutors say that Cowell stabbed Wilson and her sister, Letifah, as they were getting off a train at the MacArthur BART station in July. A grand jury indicted Cowell on murder and attempted murder in October.

Prosecutors have not announced if they will seek capital punishment, however  Wilson's mother said she wants them to seek the death penalty.