However, Lamarre told police he was buying 14 grams of marijuana from Brian Brown, the Herald reported.
Lamarre allegedly fired several shots at Brown, who died a day later in the hospital, the Herald reported.
Brown recently graduated from North Miami Beach Senior High School and was getting ready to go to Merced College in California on a full football scholarship, WFOR reported.
Lamarre, who police say confessed after being identified Monday, was charged with second-degree murder.
Read more at the Miami Herald and WFOR.