According to MSU Police documents obtained by the newspaper, a woman accused Mumphery of sexually assaulting her at her dorm in March 2015. Ingham County (Michigan) Prosecutor's Office eventually declined to press charges, according to the report.
Mumphery hasn't attended organized team activities for the Texans this week, according to multiple reports.
Bullough's release comes less than a month after the league announced he would be suspended for the first four games of the 2017 season for violating its performance-enhancing drug policy. Bullough accepted responsibility for the drug policy violation, apologizing to the Texans, his teammates and fans on Twitter shortly after his suspension was announced.
Mumphery and Bullough's releases were first reported by Mark Berman of KRIV-TV in Houston on Friday. The duo played together at Michigan State before being reunited on the Texans.
Bullough appeared 30 games for the Texans after signing with the team as an undrafted free agent in 2014. Mumphrey started in six of the 27 games he played in for Houston.