Yes, it appears the manhunt is over. Unfortunately, a dead suspect, at least one who didn't die in a gun battle with the authorities, proves nothing, so for now at least, accent on "alleged".
We'll have to wait to see if evidence at the scene implicates him in the killing. Hopefully, he had the murder weapon with him when his body was found, that records or testimony will show it was indeed one of his many guns, and that ballistics can match it to the slugs that killed the ranger.
The apparent cause of his death was not mentioned. A survivalist is unlikely to have perished so rapidly due to Nature alone. No mention was made of any self-inflicted gunshot wounds, but it would sure make pretty convincing circumstantial evidence if both he and the ranger were killed with the same rifle.
No matter the outcome, what a tragic waste of young lives!