A Troy man has been convicted of a pair of felonies for placing a date rape drug in the drink of a female acquaintance, then sexually assaulting the victim and taking pictures of her while she was unconscious.

Byron D. Skalisius, 51, was also convicted of unauthorized video recording. He was acquitted of two other criminal sexual assault charges in relation to the attack, which happened in 2009 at the victim's Glen Carbon home.

According to Madison County State's Attorney Tom Gibbons, Skalisius and the victim had previously worked together. But there was no romantic relationship between the two.

Skalisius is awaiting another trial for allegedly using the date rape drug GHB in 2008 to sexually assault another female acquaintance.

Skalisius, whose bond was revoked following the verdict, faces a sentence of 4-15 years in prison for criminal sexual assault, a Class 1 felony. He is eligible for a sentence of 1-3 years in prison for unauthorized video recording, a Class 4 felony.