According to KTRE, prosecutors said Bobby Woods Jr., 21, shoved Mason Cuttler, 3, into a pond near the family's Lufkin home and left him to drown.
Woods, who was dating the boy's aunt, Billie Jean Cuttler, said he thought she was pregnant when he killed the boy, who lived in the same home as Woods, Cuttler and "several families," The Associated Press reported. Woods believed their house was too crowded and wanted to make room for the new baby, he reportedly told police. An attorney later said the woman was not pregnant, the news agency reported.
Woods will not be eligible for parole, according to the AP.
Cuttler, 23, also initially faced a capital murder charge in the incident, but agreed to a plea deal amid concerns over her intellectual competency, KTRE and the AP reported. She received a 20-year prison sentence after she pleaded guilty to a charge of conspiracy to commit murder, authorities said.
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– The Associated Press contributed to this report.