Sarah Gumm, of Waukegan, was changing baby Rylan Koopmeiner’s diaper on July 27 when she became frustration when the infant began crying.
Assistant State’s Attorney Ari Fisz said Gumm then “put the baby down on the table such that she struck her head on it.
Around 4:30 p.m. Gumm called 911 to say that the little girl was not breathing.
Koopmeiners was rushed to Vista East Medical Center, where she died around 5:00 p.m.
Gumm had originally told police she was home alone all day with the infant, and while the baby girl was sleeping she heard a “gurgling noise” and noticed that she seemed to be in distress; however, a neighbor said Gumm was seen leaving her home in a taxi that afternoon.
It was later discovered that Gumm used her credit card twice at a local drugstore before calling the police.
She later admitted to going to the pharmacy and leaving the baby unsupervised at home. She also admitted to hitting the baby’s head on the table.
She said the baby “was getting very fussy and squirming around while she was trying to change her on a wooden table.”
The child’s parents, Nathan and Reggan Koopmeiners, of Kenosha, Wisconsin, told authorities they had dropped their daughter off at Gumm’s home in the 1100 block of O’Farrell Lane at about 6:45 a.m. on the day that she killed their child.
The Koopmeiners hired Gumm six weeks prior to their daughter’s death after seeing an online ad.