Advocate staff photo by JOHN OUBRE -- Sadie Roberts-Joseph speaks to the audience at the start of the 25th annual Juneteenth Roots and Heritage Festival on Saturday on South Boulevard.

The Baton Rouge Police Department is hosting a press conference at 2 p.m. Tuesday relating to the death of Baton Rouge civil activist Sadie Roberts-Joseph.

[UPDATE: Arrest made in the killing of Baton Rouge civil activist Sadie Roberts-Joseph]

Roberts-Joseph founded the Odell S. Williams Now & Then Museum of African-American History. She was found dead in the trunk of her car Friday in the 2300 block of North 20th Street, about 3 miles from her Scotlandville home.

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Prior to Tuesday, police disclosed few details about the case but East Baton Rouge Coroner Dr. Beau Clark released preliminary autopsy results Monday afternoon. He said Roberts-Joseph, 75, died from "traumatic asphyxia, including suffocation." Her death has been ruled a homicide.