An IQ of 69 might not be, but one low enough would almost certainly qualify one as being mentally disabled.
What that number is is beyond my area of expertise.
I am sure the court took all that into consideration before finding him guilty and executing him.
Of course his family will claim he was “mentally disabled”.
Well he is dead and nothing can bring him back.
Low IQ Score Classifications
IQ Range Descriptive Classification
1 to 24 Profound mental disability
25 to 39 Severe mental disability
40 to 54 Moderate mental disability
55 to 69 Mild mental disability
70 to 79 Borderline mental disability
80 to 89 Low average
https://www.verywellmind.com/what-is-considered-a-low-iq-2795282
Some of the wittiest people you ever heard speak had very low IQs. Muhammed Ali for example. BEFORE he took all those punches.