I am trying to replace numeric values in the status column below with the text "Dead" using `ReplacePart` but I'm not getting the desired result. Please help.

YOB status  

1910 1982  

1977 ALIVE  

1951 2012  

1977 ALIVE

```
lis = {{"YOB", "status"}, {1910, 1982}, {1977, "ALIVE"}, {1951, 2012}, {1977, "ALIVE"}}

```