Gnarrk

Earth-One
Gnarrk did not reappear until years later, when the Teen Titans encountered the new Titans West group (Teen Titans #50-52, 1977). In that tale, it was revealed that Lilith and Gnarrk were engaged to be married. Although Lilith was a member, Gnarrk was not considered a part of the West Coast based team. He actually objected to Lilith’s involvement in the group altogether. “You coulda gone to the cops instead of hooking up with this bunch, ” Gnarrk snarled. “How many times I gotta tell ya I don’t want my fiancee playin’ like she’s Wonder Woman? You coulda been hurt bad!” Lilith countered, “But I wasn’t — and I helped save a lot of people. Stop being so overprotective!”
 * 1) Lilith Clay - The Teen Titans attempted to domesticate the time-tossed, confused, and gruff cave teen Gnarrk. Lilith was able to reach him telepathically, and she sensed a warmth and kindness in him. Lilith’s soothing influence soothed him (Teen Titans #33, 1971). Gnarrk next appeared in issue #39, where it seemed he and Lillith were a solid couple.

The only former Teen Titan who did not attend the wedding of Donna Troy and Terry Long (Tales of the Teen Titans #50 in 1984), Gnarrk apparently died under unrevealed circumstances sometime after his last appearance.

Post-Crisis

 * 1)  Lilith Clay - In the revised love story, Lilith used her powers to establish a mental rapport with a mysterious cave-boy encased in ice. The two fell in love through their psychic link, even as Gnarrk remained in stasis at S.T.A.R. Labs. Within a year, the mysterious light in Gnarrk’s chest faded and he died. (New Titans #56, 1989)

It has never been stated which of these versions carried over into New Earth. At first glance, it would appear that we should assume it to be the Post-Crisis version unless otherwise stated. But given that the point of Infinite Crisis was to correct the over-rewriting of history done in the first Crisis, one may also assume the Earth-One history would come to be the case.

Thanks to titanstower.com