The drugs were at multiple storage units and homes, GCSO said.
A spokesperson said the case is the eighth fentanyl murder charge the office has filed since the state passed a law, allowing for murder charges in instances where fentanyl distribution leads to death.
Authorities in northern Mexico found 32 kilograms of fentanyl hidden inside boxes of sliced cactus, a quintessential Mexican food staple known as nopales.
The late defense attorney's charges were dropped after being accused of smuggling drug-laced papers into the Harris County Jail.
A woman was arrested after trying to fly with 13 pounds of drugs in her bag.
Montgomery County officials said evidence inside the home where the woman was discovered showed signs of an overdose, leading police to discover the man accused of giving it to her.