Elena Russo , spokeswoman for the Maryland State Police , told CNN affiliate WJZ that Walker 's wife and three children were in his vehicle at the time of the shooting . Joseph Walker , a New Jersey detective , is charged with second-degree murder . He was found dead in his car on the side of an interstate highway near Trenton after he failed to show up for work at around noon yesterday. Walker 's wife , kids were with him during the apparent road-rage incident , police say .
Joseph Walker , a New Jersey detective , is charged with second-degree murder . He was found dead in his car on the side of an interstate highway near Trenton after he failed to show up for work at around noon yesterday. Walker 's wife , kids were with him during the apparent road-rage incident , police say .