Salem police gave video evidence to investigators three months after cyclist’s death 

Salem police for nearly three months held on to video evidence related to a March fatal bike crash before turning it over to outside investigators, a delay authorities won’t explain.

Outside investigators had already submitted their initial report to prosecutors when they received the new evidence.

Authorities won’t comment on the contents of the video or the significance to their investigation into the March 28 death of a cyclist.

Marganne Allen, 53, died after colliding…