Using a function to delete rows

How do I create a function that takes as input (int4) and then deletes rows from several tables. This is what I have tried, but I can't get it to execute:

CREATE OR REPLACE FUNCTION public.deleteclient(int4)
RETURNS Void AS
'
BEGIN
Delete from clientinfo where caseid = $1;
Delete from caseinfo where caseid = $1;
Delete from tracking where caseid = $1;
Delete from casenotes where caseid = $1;
Delete from creditinfo where caseid = $1;
Delete from debts where caseid = $1;
Delete from education where caseid = $1;
Delete from employer where caseid = $1;
Delete from family where caseid = $1;
Delete from formeremployer where caseid = $1;
Delete from income where caseid = $1;
Delete from other where caseid = $1;
Delete from specialinterests where caseid = $1;
Delete from tracking where caseid = $1;
END'
LANGUAGE 'plpgsql' VOLATILE;

Thanks,
Derrick