Diciest got the right answer! Congratulations!!

Blood in the car?

They never told him where the body was found.

He knew where the crime scene was

They never told him where the scene of the crime was.

They didn't tell him where the scene of the crime was. Only murderer and the police would know such a thing if there were no witnesses.

Because they didn't tell him where the crime scene was!

He knew where the body was?

Because no one told him where the crime scene is but he knows

They never told him where the crime scene was!

They didnt tell him where to go

He knew where the crime happened

They never told him where the crime scene was.

He went to the crime scene which is his car so he didn't drive anywhere just hopped into the car and sat there.

He wouldn't have known the scene of the crime

So were the cops waiting for him to get in the car?

The police didn't tell him where the scene was and only a murderer will know where it is!!!! . He needed to think before he did it!!

His car was parked at his house

They didn’t tell him where

You silly people. "They didn't tell him where the crime scene was so he must be the killer..." right? Incorrect: the spouse is ALWAYS the primary suspect, so they sent a cop car to pick up the husband and drive him to the scene; tow truck brings his car from the house, once there, lead investigator tosses him a knife covered in wife's blood direct from her body, cops draw guns and "arrest the killer with murder weapon in hand before he could dispose of body." Forensics conveniently link "murder weapon" to "stab wounds" and bingo, conviction. Another easy case solved; another psycho taken off the streets by the loving police who just want to search your car for "reasons".