Jamie Baker, 47, allegedly told police that she used a hypodermic needle to add antifreeze into the liquid steroids that her husband James Baker used before his 2013 death.
Antifreeze contains ethylene glycol, which crystalizes in the kidneys and causes normal function of the organs to break down.
Jamie Baker was arrested in March 2014, half a year after her husband succumbed to the poison, after investigators found the compound in his steroids and an autopsy concluded the death was a homicide.
The Bakers had been married for 21 years, and had two daughters.
Baker now faces up to 15 years in prison for the second degree murder charge.
[Image: Delaware State Police]
Crime Time is your destination for true crime stories from around the world, breaking crime news, and information about Oxgen's original true crime shows and documentaries. Sign up for our Crime Time Newsletter and subscribe to our true crime podcast Martinis & Murder for all the best true crime content.