Police: Iowa City mom, kids were beaten to death

• Story Highlights
• Police say Steven Sueppel killed his wife, then tried to asphyxiate his kids
  
• When that failed, he killed them one by one, possibly with baseball bats, police say
  
• Sueppel left notes, voicemails apologizing for the slayings, police say
  
• He tried to drown himself, then crashed van deliberately and died, police say
  
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