Why was Lee Harvey Oswald a suspect?

Answer 1

He worked at the Texas School Book Depository warehouse where the shots were fired from. He was seen carrying a long thin package into the TSBD which he claimed were curtain rods. He was seen on the sixth floor of the TSBD 30 minutes before the assassination. A witness on the street saw the gun being fired from the sixth floor and gave a description of the gunman which matched Oswald. He left the building minutes after the assassination. He was the only person to leave the TSBD between the assassination and when the police surrounded the building.

He took off leaving behind prints, shells, his rifle, and the bag he carried it in. Every other employee in the building stayed. After a witness described him to the police, his description was radioed out. A Dallas Police officer named J. D. Tippet pulled over to question Oswald, and Oswald shot him to death. He then hid in a theater to avoid cop cars (without paying) and when the police arrived (he'd been spotted doing it), he tried to shoot them too. Killing cops is a really bad way of saying "I'm innocent", so he did indeed make a good suspect!