I believe the murderer is
And you're really good with my whodunit. And the "Down" doesn't actually mean down. But the numbers are the answer to solve the words. 4x7 actually mean 4 words a row and 7 means there are seven rows. But I see you are smart and got the answer. Good job!
Addition-
DOWN O MAE CJSA TO TBON HCRE EDTSOE=
DOWN
OMAE
CJSA
TOTB
ONHC
REED
TSOE