A Lakeside man was killed Saturday morning in Twentynine Palms riding his off-road motorcycle without a helmet. According to Sheriff’s reports, Marshall Winn, 31, left his family and friends about 9:30 to go for a motorcycle ride in the open desert. When he did not return, they went looking for him and found him on the ground next to his wrecked bike near Mission Avenue and Foothill, south of Knott’s Sky Park. Marshall Winn was confirmed dead by arriving emergency personnel at 11:08 Saturday morning. The Sheriff’s Department is investigating the death.