1:15 PM PT -- TMZ Sports just obtained Browner's mug shot

Ex-Seattle Seahawks star Brandon Browner was arrested in Los Angeles on Monday night, TMZ Sports has learned. 

The former Pro Bowl cornerback -- part of the original Legion of Boom -- was booked for allegedly making criminal threats, a felony.  Sources tell us the alleged victim is a woman. 

Browner was taken into custody and his bail was set at $50,000. He posted bail and was released just after 11 PM. 

According to his booking sheet, 33-year-old Browner is listed as 6'3", 215 lbs. 

We reached out to Browner for comment. So far, no word back.