The parents of the 24-year-old man accused in a string of serial killings in a Tampa neighborhood refused to answer investigator's questions about their son.
They will now go before a judge.
Investigators wanted to question Howell Donaldson Jr. and Rosita Donaldson on Tuesday about Howell Emanuel Donaldson III. They did not comply.
State Attorney Andrew Warren called the refusal a "rarity." He says most people understand they have a duty to answer questions.
His office has asked Hillsborough County Judge Margaret Taylor to consider whether they should be held in contempt. A hearing is set for 10 a.m. Thursday.
The younger Donaldson faces four counts of first-degree murder in the apparently random shooting spree. He was arrested Nov. 28.