A Tucson mom is upset about how her daughter and her infant grandson are being remembered at a south side cemetery.

In October of 2006, Pima County sheriff's deputies say a drunk driver ran a red light at the intersection of Palo Verde and Irvington.

A pickup landed on top of a Dodge Neon, killing 21 year old Skylynn Hartmann and her infant son Caleb.

The suspect ran-off, but was later caught.

Her mother thought the accident was tragic enough, until she went to visit her daughter and grandson's grave.

"When I saw the mother angel holding the baby angel I thought that's fitting for them," says Mary Ann Hartmann.

The headstone arrived several months ago, but recently when Mary Ann cleaned it off, she noticed something strange: she could see mysterious letters and numbers. A scripted letter is most visible.

"This was somebody else's gravestone that they had started making for someone else," she says.

She suspects the company who made it started it for someone else, but didn't finish.  She thinks the company then sanded it down and sold it to her.

"I waited two to three months to get something I thought was brand new and now six months later I'm finding out this isn't brand new at all," she says.

Mary Ann says she bought the gravestone through South Lawn Cemetery.

The cemetery's general manager declined an on-camera interview, but said over the phone this is the first complaint like this one they've received.

He adds the vendor who made the headstone has been reliable in the past.

The cemetery wouldn't name the vendor, but has offered Mary Ann a free replacement.