VANCOUVER - This viral video shows world's most famous sea otter Milo in happier times. The otter died yesterday after six months of chemotherapy at the Vancouver Aquarium failed to stop his lymphoma.

The 12-year-old Milo was seen by over 16 million people when a YouTube video surfaced several years ago of him and his late partner Nyac holding hands in their tank.

"Milo was the first live sea otter to be diagnosed with lymphoma and the first sea otter treated with chemotherapy in the world," the aquarium said in a press release. "His response to treatment had been very positive for almost six months. Between intensive treatments, Milo spent time in his sea otter habitat with companion Tanu."

More to come.