A pathologist would indeed seek the expertise of a toxicologist if poisoning was suspected, as toxicologists specialize in the effects of poisons and could help determine the cause of death.
True, a pathologist would likely want to speak to a toxicologist if there was a suspicion of poisoning. The field of toxicology is specifically concerned with studying the adverse effects of chemical substances on living organisms and encompasses understanding poisons and their effects.
During an autopsy, if a pathologist sees signs that suggest poisoning might have been a factor in death, consulting a toxicologist would be an important step. A toxicologist could provide insight into the potential poisons that could be involved, conduct specific tests to identify the presence of toxins, and help interpret the toxicological findings, contributing to determining the cause of death.