andrew silicani , 23 , of cheyenne , wyoming , pleaded guilty on monday to trying to hire a hit man to kill his mother and stepfather .
the prison inmate had wanted to collect their life insurance money and inherit their house .
silicani , who was serving a five - to seven-year sentence at the state prison in rawlins , now faces up to 40 years at sentencing this summer .
silicani told the judge he regarded his actions as ` a big error in judgment -- i 'd take it back if i could '