WASHINGTON, D.C. -- The fungal meningitis outbreak is now at the center of a congressional hearing in Washington.

Lawmakers said they want to know who knew what and when.

The president of the compound pharmacy connected to the outbreak took to the stand to testify. But he refused to answer questions under the fifth amendment.

The widow of a meningitis patient also addressed lawmakers.

"Whoever is responsible, I want them to know, their lack of attention to their duties cost my husband his life," said Joyce Lovelace.

She also asked lawmakers to work together to help other families avoid the same loss.

The FDA commissioner and a Massachusetts state health official also testified during the hearing.