As federal agents launched a criminal investigation into two produce companies involved in the contaminated spinach outbreak, Idaho health officials confirmed the death of a 2-year-old boy Sept. 20 was caused by tainted spinach, the Associated Press reported today.

Kyle Allgood was the second confirmed death in the E. coli outbreak, which also killed a Wisconsin woman.

"This confirms what we suspected for quite some time," said Ross Mason, a spokesman for the Idaho Department of Health and Welfare. "Confirming that, though, was important information and will help us in the future if we have similar situations."