Marvin Charles Gabrion (born October 18, 1953) is an American murderer, rapist, and suspected serial killer convicted of the 1997 kidnapping and murder of 19-year-old Rachel Timmerman, of Cedar Springs, Michigan. Timmerman and her 11-month-old daughter, Shannon, disappeared two days before Gabrion was set to stand trial on rape charges filed by Rachel the previous summer. Rachel's body was found in Oxford Lake, weighted down by cinder blocks. Shannon remains missing, but is presumed deceased. Although Gabrion was not tried for killing Shannon, court documents describe her murder as “virtually undisputed.”