Adding animation from other model on character

Hi there,

New to Unity 3D -5 and dizzy about the new animation system. I've got this character that I set up with a Third Person Controller, animator, etc. Its working like it should with the sample animations. However, I need some extra animations like "Die" and "action". These animations I have found on some other models. What is the best way to integrate those new animations on my character model? I found out that I should use the Animator and add the new animation there using tree etc. Ok so far so good, they are in the animator list... But they won't play in a loop, only once and I need to connect one animation to keypress "e" and another to keypress "c". I guess this is done by using scripts. But the scrips that worked in 4.3 are now obsolete ?

Thanks in advance for the help.