I think the murderer wanted her, Sievers, THAT PARTICULAR PERSON, dead & gone. Murder 'by hammer', I am guessing, is rage-related - I wonder if murderer bashed up her skull, her face ?? Somebody who hated her mind, how she looked, how she acted, what she said. This murder seems 100 percent planned & organized, NOT random, NOT chaotic. NO random seeing her & trying to 'run her off the road while she's driving home from the airport'. I think the person was there, waiting in prey', inside the house, hammer in hand. Remember there's a lot of types of hammers, some big, icky, 'one strong whack would do it' sorts of hammers. From police, sounds like overkill, too - very much personal.
REMEMBER how Sheriff had his 'strolling by the water' press conference?? Sheriff was downright nonchalant. HE knows who murderer is.
ALSO, IMO, Sievers' sister & the funeral PASTOR also both know who the murderer is - BOTH of these two said things along the lines of 'Sievers was killed over speaking her mind'.
My theory is it's someone in the office who wanted Sievers to get rid of another 'key' employee (NOT Sievers' hubby, cuz' the staff would know not to 'cross that line' to criticize her hubby...). I'm guessing the 'key' employee who would/could really irritate the office staff/rub them the wrong way, and get somebody really made, boiling with rage, would be you-know...
Why is it taking so long for there to be an arrest?