Yes he was but Loki killing him started ragnarok. I think the only ones that survived that was odin's sons.
Baldr had prophetic dreams about dying so his mom (Frigga) made everything swear to not harm him, everything except holly. The other Norse Gods had a fun time throwing stuff at him, because they would never hit/hurt him. Loki found out that holly could hurt him and told Hod, who was blind, to throw/shoot it a Baldr. Loki guided the arrow and killed Baldr. A total jerk move.
It gets worse. Frigga managed to talk Hel (Goddess of the Underworld) into letting Baldr go, if
everything/everybody would weep for him. Everybody did except for a certain hag in a cave. This hag was Loki in disguise. So, Baldr stays in the underworld until Ragnorak.
The Norse Gods did find Loki. They bound him in a cave and put a serpent above him to drip venom on him. His wife catchs the venom in a cup and whenever she turns away to pour the venom out, some of the snake's venom drips on Loki and causes earthquakes.
Also, keep in mind that Loki is Odin's blood-brother. He was a pretty decent guy, to the Norse Gods at least ,prior to this. He help them build a huge wall (this caused him to give birth to Sleipnir, an 8-legged horse), helped Thor retrieve his hammer, and many other things.