Hearing on Mario Willis arson case continues

Testimony from a defense expert stating that the 2008 Detroit fire that killed firefighter Walter Harris may not have been arson, challenging the investigation that led to Mario Willis’ conviction, continued Wednesday. Marc Fennell, a fire investigation expert called by Willis’ defense team, testified that the original fire investigation was flawed and that the cause should have been classified as “undetermined” rather than arson. His testimony continued on Jan. 7 with cross-examination from the prosecutors.