A Colorado mother of two died on Tuesday after jumping into a lake to save her 2-year-old son from drowning.

Chelsey Russell, 35, kept her son above water for at least five minutes in Utah’s Lake Powell, but she was unconscious when a relative pulled them both out of the water, CBS News reported. Back on shore, she was unable to be revived with CPR.

The toddler, who fell off the houseboat while playing with another child, was taken to the hospital in stable condition as a precaution, CBS News reported. Russell’s brother and mother were also on the boat at the time.

Her brother initially jumped in after them but turned around to get a motorboat attached to the houseboat when he realized Russell and her son, neither of whom had been wearing life jackets, were too far away. Russell, who also has a 5-year-old daughter, kept the 2-year-old above water until her brother reached them, according to CBS News.

[CBS]

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Write to Katie Reilly at Katie.Reilly@time.com.