does creature lose attack when creature with battlecry dies

[Frintor]

does creature lose attack when creature with battlecry dies

[Arix]

No. Like all triggered abilities, once battle cry has triggered, it exists independently of its source. No matter what happens to the creature afterwards, the power bonus will stay until the end of the turn.

[DatAsh]

You mean lose the power boost it gets? No. It's a triggered ability that exists independent from it's source once triggered.