Lawrence police are asking for the public’s help in locating a 24-year-old man. Grant Holderman, who has a mental disability, has been missing since Jan. 30. He moved to Indiana from Pennsylvania in late December. His sister said he went for a walk but never returned. Holderman, who is 5-foot-11 and weighs 320 pounds, was last seen in the 8900 block of Brigadier Drive.