Dragon Ball Super - episode 71 - 17 Dec, 2016

Goten and Gohan notice their father Goku acting strangely as they spent all day following him before Gohan decides to direct the direct approach during dinner. It was after dinner that Goku admits to Gohan and Goten that someone wants to kill him. Elsewhere, as Vegeta notices Whis is hiding something while assuming Super Saiyan Blue to pass his training regime. Meanwhile, in the Sixth Universe, Hit finished assassinating a crime boss and learns his next target is Goku. Goku senses Hit coming and flies off to a remote area where no one would get caught up in their fight, Hit arrives and assures Goku that he has more than his Time-Skip. Goku finds his attacks unable to hit a tangible Hit, seemingly killed with a single invisible blow to the heart as he fires his energy attack into the air before collapsing as Piccolo, Gohan, and Goten arrive. (Source: Wikipedia)