(CNN) -- His testimony delayed for more than a year, an arson expert Friday sharply criticized the investigation that led to the 2004 execution of a man convicted of killing his three daughters in a house fire.
Craig Beyler has written that the finding of arson at the heart of Cameron Todd Willingham's murder conviction "could not be sustained," either by modern science or by the standards of the day.
"The basics of (this) investigation is such that you could not come to the conclusion that there were arsons, they are undetermined," Beyler, a Maryland-based fire science expert, told the Texas Forensic Science Commission on Friday, according to CNN affiliate KVUE.
"By their acknowledgment, child fire setting, somebody else coming in and setting the fire, are things they acknowledge were not ruled out," said Beyler. "And in this case, they shoveled out the bedroom in the Willingham case before examining the electrical evidence, so you can't rule that out as a cause."
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