Actor Bill Paxton, well-known for memorable roles in films such as Aliens, Twister, Titanic, Apollo 13, and The Terminator , died Saturday at the age of 61 due to complications during surgery. More recently a star on television, Paxton commanded the lead role in HBO’s Big Love for five seasons, played John Garrett on the first season of Agents of S.H.I.E.L.D., and currently stars in the CBS’s reboot of Training Day .