many of those heard chanting slogans like "no justice, no peace" and "black lives matter" were students from local high schools around the city, as well as from the university of wisconsin. students left their classes there this morning and marched down to the state capitol for a third day of protesting. on friday a veteran madison police officer responded to a call about a suspect jumping in and out of traffic after having assaulted someone. the officer then pursued the suspect, that's tony robinson, into a nearby apartment, and the officer forced his way into that apartment, and police say the unarmed teenager assaulted the officer before the officer shot and killed him. today the madison chief of police apologized in an online post to the family of the slain teen saying, reconciliation cannot begin without my stating i am sorry. i don't think i can say this enough. i am sorry. the shooting is being investigated by the wisconsin division of criminal investigation, which is part of the state's department of justice.