23-year-old Tyler Lowis of Sparta is facing life in prison after pleading guilty to several felony charges in connection with the sexual assault of two young boys.

WZZM-13 reports that Lowis admitted to abusing the boys over a two-year period beginning when they were 13 and 11 years old.

Previous reports indicate that Lowis would have one of the boys wear a diaper, and would sometimes put a pacifier in his mouth to muffle his screams. In videos found on Lowis' personal tablet, he can be heard referring to himself as "daddy" and referring to the boy as "baby boy".

In court Thursday, Lowis plead guilty to four charges, including two counts of first-degree criminal sexual conduct. Those two counts alone carry a maximum sentence of life in prison. He will be sentenced in September.

The investigation into this case began after Michigan State Police received a tip from the National Center for Missing and Exploited Children claiming that Lowis was amassing a collection of child pornography through a DropBox account.