The three defendants convicted in a murder case where investigators used a traffic cone to help solve the crime have been sentenced.

The Fulton County District Attorney's Office tells 11Alive 33-year-old Michael Dawson, 31-year-old Jamel Gines, and 33-year-old Dontravious Mahone were all sentenced Monday afternoon.

Dawson was given life in prison plus five years. Gines and Mahone were both sentenced to life in prison plus 15 years. 

Officials said on the morning of April 21, 2016, 21-year-old Kadarius Medlock was celebrating his birthday at home when the three suspects allegedly pulled their maroon Hyundai into his driveway on Wade Creek Road in Alpharetta. 

RELATED: Traffic cone helps secure murder convictions against three Fulton County robbers

The district attorney's office said Mahone wore a safety vest and pretended to be a utility worker. They said He placed an orange safety cone in the driveway to further sell his disguise. The three defendants then invaded Medlock’s home through the front door. They allegedly tied the victim's hands behind his back with an extension cord while they ransacked his home. 

As they were leaving, the defendants allegedly fired two shots, one shot to the back of Medlock’s head, and he died at the scene.

But it was what they left behind before speeding that led detectives on a trail to solve the case. The traffic cone - the one used as a prop in a disguise - was still at the scene. Authorities started with that and ultimately helped make the case against all three.

The three men were charged and later convicted of murder, felony murder, aggravated assault with a deadly weapon, first-degree home invasion, armed robbery, first-degree burglary, false imprisonment, possession of a firearm during the commission of a felony, financial transaction card fraud, identity fraud and possession of a firearm by a convicted felon.