(CNN) — A weeklong manhunt is over in the killings of the parents, grandmother and teenage uncle of a baby found abandoned in Tennessee.

Austin Robert Drummond was arrested Tuesday morning in the woods in Jackson after residents saw him. The 28-year-old is a convicted felon with alleged ties to a violent street gang who was out on bail on an attempted murder charge and dating one victim’s sister, officials have said.

He is due at 9 a.m. local time Thursday in Lake County General Sessions Court for an arraignment. Still, a motive in the killings and why the baby was abandoned a county away from where the bodies were found remain a mystery.

Here’s what we know – and don’t – about the case so far:

Suspect was out on bond last week

After getting out of prison last year in a robbery case,

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