Winston Earl Corbett, 25, was sentenced to 115 years on Monday in Indiana
He was found guilty in the murder of Goshen College professor James Miller
Miller was brutally stabbed to death in his home and his wife was badly injured
Corbett was only arrested in 2018 after DNA evidence pointed to him
At trial, he denied the murder and said he didn t know why his DNA was there
A jury took just two and a half hours to convict after eight-day trial