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Scott Cawelti's "Brother's Blood"

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This hour we visit a conversation host Ben Kieffer had with author Scott Cawelti, who tells us about the infamous Mark family killings and reflects on the mind of a mass murderer.

On Halloween night in 1975, Jerry Mark murdered his brothers’ entire family…four people, including two young children, in Cedar Falls. Since 1976, Jerry Mark has been held at the Iowa State Penitentiary in Fort Madison where he is serving four consecutive life sentences.

Cawelti’s book, "Brother’s Blood", takes readers inside the murders that sent shock waves through the community of Cedar Falls and the state.

Ben Kieffer is the host of IPR's River to River