“My heart is broken and words can't explain how I feel right now.”
More than $5,000 has been raised as of Monday afternoon, according to the website.
Lincoln said she identified her son, a freshman at James Madison High School, through a photo provided to her by police, WISN reported.
In a news release Sunday night, the Milwaukee Police Department said it was investigating as a homicide the death of a teenage boy whose body was discovered in the early morning hours. On Monday they identified the victim as King, the Journal Sentinel reported.
Several suspects in the case were arrested, family members told WISN.