By Eric Cox and Brendan O’Brien HIGHLAND PARK, Ill. (Reuters) -The man accused of attacking a Fourth of July parade in a Chicago suburb bought his rifle legally, fired more than 70 rounds from a roof and dressed in women’s clothing to blend into the fleeing crowd afterwards, local officials said on Tuesday. The suspect, 21-year-old Robert E. Crimo III, surrendered to police on Monday, hours after the attack in Highland Park, Illinois, that left seven people dead more than 30 others wounded. Police revised the confirmed casualty toll on Tuesday with the death of a seventh person who had been ho…