Baron Calmese, 31, entered guilty pleas for two charges, one of which was the theft of more than $500 after he requested $2 in quarters while visiting his sister's home in July 2012 and was told he could find the coins in the child's bank.
Investigators said he emptied the bank and spent the money on drugs and prostitutes.
Court records show Calmese also pleaded guilty to an unrelated burglary and stealing charge in December.
St. Louis County, Mo., Judge Gloria Clark Reno sentenced Calmese to seven years in prison Monday, KSDK-TV, St. Louis, reported.
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