WALKER, MI (WKZO) - The two men who killed Officer Trevor Slot were a couple of long time bank robbers, who actually met in federal prison in Milan after both were arrested for earlier bank jobs.

Apparently 36 year old Kristopher Cheyne and 32-year-old Derryl Lafave thought they could do it better and not get caught.  Witnesses at the Revenna Bank they robbed Thursday say they were methodical, efficient, covered each other and were in control.   

They were starting a business together to teach tactics using airsoft rifles.  Apparently they applied those skills to bank robbery.  They finally were engaged in a battle with police out on I-196. 

Flowers, pictures and other tributes are collecting in the lobby of the Walker Police station, a memorial to Police Officer Trevor Slot who was killed in the Line of duty on Thursday.  The Station has been draped with black and purple bunting.

Bill Kozal, with Mi-Cops, a group that works with the families of slain police officers, says it rattles the community to see a police officer die.  He says the families of public servants make a living wage, not a luxurious one, and are often left in financial straights when the breadwinner dies.

A community vigil is planned for this evening at 7:30 at City Central Park to remember the slain officer.   A memorial fund to help the Slot family has been set up and donations can be made at any Lake Michigan Credit Union.