Man, Held On ChargeOf La Crosse Murder- -LA CROSSE. TV fa. —The arrest here yesterday of Walter Straton alias Claud Dooley, is believed to have solved the mvstery surrounding the murder of Frank Coligan, railroad- switchman, in Copeland Park here June 13. 1920. Arrested at a hotel. Stratton admitted, police claim, that he fought a knife battle with Colieran. hut denied knowledge of the fact that Coligan had died.