A jury heard disturbing testimony this week in the trial of a mother who is accused of poisoning her 5-year-old son to death using salt.

Prosecutors say Lacey Spears poured salt through her son Garnett’s feeding tube at a hospital. His doctor testified that Garnett would have had to drink five bottles of salt water for his sodium to spike to that level.

Court documents say Spears looked up “dangers of high sodium” and “insulin poisoning with suicidal intent” online.

Investigators say that Spears may have been trying to gain sympathy. The “mommy blogger” documented her son’s decline on social media.

Spears brought her son to the hospital early last year. Soon afterwards, his sodium level rose, his brain swelled, he had seizures and then he died.

The defense argues that there is no evidence that Spears killed her son, but former prosecutor Dan Schorr explained today on “Shepard Smith Reporting” that this is a circumstantial case, and circumstantial cases can be very strong.

Spears is charged with depraved indifference murder and faces 25 years to life, if convicted.