my 2nd cousin's death in WWII

My 2nd cousin, Donald R. Morrison, from Sterling, Worcester County, Massachusetts (serial #31257380) was killed in action on April 25, 1945. DOB 12 Sept 1919. I know he was in the US Army, but I would like to know more information about his Division and Unit if possible. There is some information on the Internet that he died in Czechoslovakia, but no one can substantiate that claim. Thanks very much for your assistance. He was awarded the Purple Heart but no one in my immediate family knows anything about this, which is a shame!

Marie