Danny Price was a Detective with Baltimore P.D and also the partner of former detective-turned-NCIS Special Agent Anthony DiNozzo.
Their partnership ended after Tony discovered that Danny was involved in money-laundering and as such, was also a dirty cop.
Unable to take anymore, Tony subsequently resigned from the Baltimore Police Department, joining NCIS instead.
The two had no such contact up until Price's death at the hands of his boss which caused DiNozzo to remember his time at the Baltimore P.D as well as the events that led to him eventually joining NCIS and becoming an NCIS Special Agent.
Price was skilled in the use of firearms.
Price's legacy as a Detective of the Baltimore Department was in a sense a double-edged sword. He led many investigations and solved many cases but in reality, was a corrupt cop, having given into the greed and need for money.
Despite that, Tony still thought of Price and was left extremely saddened upon learning of Price's murder.