A sixth person, a child, has died from injuries from the crash, a prosecutor said at the suspect's first court appearance.

The suspect, Darrell Brooks, is a registered sex offender in Nevada, where he was convicted in 2006 of impregnating a 15-year-old.

As a result of that conviction, Brooks was arrested 10 years later when he failed to obey sex offender laws. He bailed out on the charge but never returned to court, according to police in Sparks, Nevada. A warrant was issued on Aug. 15, 2016 for that failure to appear.

-ABC News' Aaron Katersky

Darrell Brooks, the man suspected of plowing his car into the Christmas parade, is set to make his first court appearance at 5 p.m. ET Tuesday.

The initial charges against Brooks, 39, are five counts of first-degree intentional homicide.

Members of the Waukesha, Wisconsin, community gathered at a candlelight vigil Monday evening to honor the victims who were killed and injured at the Christmas parade the day before.

Hundreds of people gathered at the event, which was hosted by the Association of Waukesha Congregations, the Brookfield-Elm Grove Interfaith Network and the Interfaith Conference of Greater Milwaukee.

The identifies of the victims are continuing to be released.

Ten of the 18 children taken to Children’s Wisconsin hospital were admitted to the ICU, including six children in critical condition, hospital officials said.

Three of the ICU patients are in serious condition and one is in fair condition.

Another eight patients were admitted in fair conditions and two of the 18 children have since been discharged, officials said.

The hospitalized children range in age from 3 to 16 and include three sets of siblings, officials said. Injuries include serious head injuries and broken bones.

Six children were sent to the operating room Sunday night and another two children will undergo surgery on Monday, officials said.

-ABC News' Josh Hoyos