"Science cannot sustain this hypothesis," Huerta said.
Any scientific investigation into Chavez's death, Huerta said, could be complicated by the fact that Chavez's body has already been embalmed so that it can be placed on display in a Caracas museum.
"If they want to investigate ... they should have already taken all the tissue samples," he said.
It's unlikely the scientific commission Maduro spoke of this week will ever be formed, according to Fernando Gerbasi, a Venezuelan analyst and former diplomat.
"This is political speculation," he told CNN en Español. "They have wanted to use to the maximum Chavez's death for political purposes."