This is how these things get started. Apparently, there were some police cars parked in front of Jay Leno's house yesterday, so TMZ went in to investigate, to see if everything was okay, and they got a glib response from the talk show host.
"The cops were at my house? When? Earlier today... oh... because of the murder!" said Leno.
There was filming in the area, so that's probably the real reason the police cars were there.