For the first time in weeks, Steven Matula, the brother of missing Eden Prairie woman Mandy Matula, will join other friends, family and volunteers to search for his sister Sunday on the Mississippi River near St. Cloud. Mandy Matula, 24, disappeared May 1, last seen with ex-boyfriend David Roe, who fatally shot himself in the head outside the Eden Prairie Police Department the next day when called in for questioning. He was attending St. Cloud State University, which is why searchers are focusing there.