The boss was killed

I mates!

Yesterday, I was doing a mission for the Don Guillermo and I had to kill the guerrilla chief of that island. I killed him and now he is not there to give me the guerrilla missions. This already happened to me with two chiefs and now in any part of the day are there.
Any help?

The question is that i kill the chief one in mission and the other accidently and now soldiers tell me the chief is inside of a tent or a house but there's no chief inside of anything they really died and now i don't have quests.

Anyone know a solution?