The firefighter who was the lone survivor of a crew of firefighters overtaken by a blaze outside Twisp on Aug. 19 underwent his third surgery Monday at Seattle's Harborview Medical Center.

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Daniel Lyon, the U.S. Forest Service firefighter who was the lone survivor of a crew of firefighters overtaken by a blaze outside Twisp on Aug. 19, continues to improve after a surgery.

Harborview Medical Center spokeswoman Susan Gregg, in a statement Monday, said Lyon, 25, of Puyallup, remains in serious condition in intensive care at the UW Medicine Burn Center at Harborview in Seattle.  She said Lyon underwent a third successful burn surgery on Monday. Additional  surgeries are planned.

Lyon was burned over 60 percent of his body when the fire overtook the truck he was riding in with Tom Zbyszewski, 20; Andrew Zajac, 26, and Richard Wheeler, 31. The three other men were killed.

Officials are hoping Lyon can shed light on how the accident occurred.

The three dead firefighters were honored at a memorial in Wenatchee on Sunday.

Related: More stories about wildfires in Washington