According to a tweet by safety Abram Elam, it appears as though the Cleveland Browns have signed defensive back Quincy Butler to the 53-man roster:
Congrats to my boy Quincy Butler new addition to Cleveland Browns secondary!
he came from the Rams we were teammates in Dallas our rookie year!
Butler spent a couple of years on the practice squad of the Cowboys and Rams. He played in 14 games with St. Louis last year, starting in seven of them. He finished the year with 28 tackles and 5 pass deflections. When the Browns faced the Rams in the preseason, Butler was the player who picked off Seneca Wallace's deep pass intended for Carlton Mitchell.
Right now, there is no word on who the Browns waived to make room for Butler. Also, there could be more roster changes on the horizon. An official announcement should come later in the day.