36-year-old Yesenia Sesmas intended to raise the child as her own after she lost her own child months before, prosecutors have said.
She pretended to friends and family that she was pregnant again – holding a baby shower and preparing her home for a new arrival.
She shot her 27-year-old victim in the head before abducting six-day-old Sophia Gonzales in the November 2016 attack.
The baby was found safe less than two days later at Sesmas’ apartment in Dallas and was returned to her family.
The jury found Sesmas guilty of first-degree premeditated and intentional murder, kidnapping and interference with parental custody.