An English professor at a private college in Colorado murdered his wife in a “sustained, vicious attack,” fracturing the woman’s skull and breaking multiple bones in her face while beating her “severely” prosecutors say — and their infant daughter was found dead, too.

Nicholas Myklebust, 45, is accused of pummeling his wife Seorin Kim, 44, to death in July at their home in the 3200 block of North Syracuse Street. The couple’s 2-month-old daughter was also found dead at the home, though her cause of death is still being determined.

Prosecutors detailed what allegedly happened at a preliminary hearing on March 21, during which a 911 call was played featuring Myklebust, a professor at Regis University in Denver, who claims to have found Kim after what he assumes was a fall of some sort. Myklebust said Kim was holding their daughter in a front carrier and he believes she possibly fell on top of the child and suffocated her.