DeMarco Murray, girlfriend Heidi Mueller respond to cheating allegation?

Zoo day with the kiddos! pic.twitter.com/TKJ0CLOX1F

— Heidi Mueller (@TheHeidiMueller) July 29, 2014

@DeMarcoMurray pic.twitter.com/xa5zEUHFtp

— Heidi Mueller (@TheHeidiMueller) July 5, 2014

❤️my family pic.twitter.com/etkMmxebL3

— Heidi Mueller (@TheHeidiMueller) April 26, 2014

Beyoncé pic.twitter.com/wqpbtGntAW

— Heidi Mueller (@TheHeidiMueller) July 23, 2014