The man who killed Brandon Yates was known to be violent, and was already classified as “keep separate” — not to be placed in a cell with another person.

After 24-year-old Brandon Yates was found sleeping in someone’s backyard, he was booked in the San Diego Central Jail, according to a new federal lawsuit over his death. Less than 24 hours later, Yates,

Brandon Yates, who suffered from mental health and substance abuse issues, was dead within a day of being arrested for sleeping in the backyard of a residence.