GRAND RAPIDS, MI -- A pair of brothers are headed to prison after police say a bank robbery note -- written on the back of a probation office form -- led them to the culprits of an October 2017 heist.

Michael Sterling Jr., 29 and his 27-year-old brother, Dominike Sterling, were sentenced Thursday, Feb.14 in Kent County Circuit Court to prison terms.

Both earlier pleaded to a bank robbery charge.

Michael Sterling Jr. was sentenced to four to 50 years in prison and his brother to three to 50 years.

Police said the robbery happened Oct. 25, 2017 at the Huntington Bank, 1949 44th St. SE, and the robbers escaped with $2,200. The brother who passed the note implied he had a weapon in his pocket.

Another person was by the door, acting as a lookout.

When police began investigating the robbery, they noticed the note left with a teller was written on a federal probation office form with an Aug. 27, 2017 date on it. They determined that Michael Sterling, who was on probation, was a client that day at the office.

“This is an extremely serious circumstance," Judge Mark Trusock said before sentencing Michael Sterling